Pepwave Surf soho 8.1.2 no AP controller for Mesh Wifi

I noticed that under AP tab there is no AP controller setting. I have to setup a mesh wifi network between this router and the APs. I have to manually set up each of my APs (AP One AC Mini firmware 3.9.0). Are there any docs on this ? It is not clear from the AP One AC Mini manual how to do this.

Thanks!

Surf SOHO doesn’t have AP controller in its firmware. Only Balance series and select Max devices